CN104560111B - Heat-transfer pipe and use its pyrolysis furnace - Google Patents

Heat-transfer pipe and use its pyrolysis furnace Download PDF

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Publication number
CN104560111B
CN104560111B CN201310512687.2A CN201310512687A CN104560111B CN 104560111 B CN104560111 B CN 104560111B CN 201310512687 A CN201310512687 A CN 201310512687A CN 104560111 B CN104560111 B CN 104560111B
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CN
China
Prior art keywords
heat
transfer pipe
ratio
breach
twisted sheet
Prior art date
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Active
Application number
CN201310512687.2A
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Chinese (zh)
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CN104560111A (en
Inventor
王国清
张利军
周先锋
刘俊杰
杜志国
张永刚
张兆斌
周丛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
Original Assignee
Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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Application filed by Sinopec Beijing Research Institute of Chemical Industry, China Petroleum and Chemical Corp filed Critical Sinopec Beijing Research Institute of Chemical Industry
Priority to CN201310512687.2A priority Critical patent/CN104560111B/en
Priority to CA2832083A priority patent/CA2832083C/en
Priority to GB1319082.2A priority patent/GB2519606B/en
Priority to FR1360637A priority patent/FR3012591B1/en
Priority to SG2013080742A priority patent/SG2013080742A/en
Priority to BE2013/0737A priority patent/BE1022059B1/en
Priority to RU2013148375A priority patent/RU2640876C2/en
Priority to BR102013027956-0A priority patent/BR102013027956B1/en
Priority to NL2011705A priority patent/NL2011705B1/en
Priority to JP2013226900A priority patent/JP6437719B2/en
Priority to DE201310222185 priority patent/DE102013222185A1/en
Priority to KR1020130131030A priority patent/KR102143481B1/en
Priority to US14/068,543 priority patent/US10209011B2/en
Publication of CN104560111A publication Critical patent/CN104560111A/en
Application granted granted Critical
Publication of CN104560111B publication Critical patent/CN104560111B/en
Priority to US16/232,759 priority patent/US11215404B2/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G9/14—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
    • C10G9/18—Apparatus
    • C10G9/20—Tube furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/0005—Baffle plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/02—Influencing flow of fluids in pipes or conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0059—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for petrochemical plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
    • F28F1/36—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely the means being helically wound fins or wire spirals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/02—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by influencing fluid boundary
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The present invention relates to a kind of heat-transfer pipe and the pyrolysis furnace of this heat-transfer pipe of use.The heat-transfer pipe includes the twisted sheet being arranged on inside pipe wall, and twisted sheet twist extends along the axial direction of heat-transfer pipe.The nonpenerative breach extended from an end of twisted sheet towards the other end along heat-transfer pipe axial direction is provided with twisted sheet.Good heat-transfer effect is had according to the heat-transfer pipe and pyrolysis furnace of the present invention, and droop loss is also smaller.

Description

Heat-transfer pipe and use its pyrolysis furnace
Technical field
The present invention relates to a kind of heat-transfer pipe, the heat-transfer pipe is particularly suitable for use in heating furnace.The invention further relates to passed using this The pyrolysis furnace of heat pipe.
Background technology
Pyrolysis furnace is the visual plant in petrochemical industry, and it is mainly used in heating cracking stock realizing that cracking is anti- Should, therefore need in cracking reaction substantial amounts of heat.According to the Fourier theorem of diabatic process：
Wherein q is heat output, and A is heat transfer area, and k is heat transfer coefficient, and dt/dy is thermograde.With petro chemical industry In pyrolysis furnace exemplified by, in heat transfer area A（Determined by the ability of pyrolysis furnace）With thermograde dt/dy（By furnace tube material and combustion The ability of burner is determined）It is determined that in the case of, the method that can uniquely improve unit area heat output q/A is exactly to improve heat transfer system Number k.Heat transfer coefficient k is influenceed by factors such as thermal resistance, the thermal resistances in boundary layer of main fluid.
It is theoretical according to the special boundary layer flow in Pulan, when real fluid flows along solid wall surface, it is close to one layer of wall Very thin fluid, will be attached to wall and does not slip, i.e., the flow velocity close to the fluid of wall is zero, and the layer just forms boundary layer.This Although individual boundary layer is very thin, its heat transmission resistance is very big, after heat is by boundary layer, it is possible to be delivered to main flow rapidly Body.Therefore, boundary layer is thinned by certain mode, will effectively increases heat output.
In the prior art, the boiler tube of the conventional pyrolysis furnace in petroleum chemical industry generally has following structure：（1）Splitting Solve axially being set from the arrival end of boiler tube to the port of export in one or more regions or Zone Full tube wall along boiler tube in boiler tube Fin on surface, fin is by axially the extending spirally on inner surface of tube wall along boiler tube.Although fin can reach agitation stream The purpose of body is to reduce the thickness in boundary layer as far as possible, but with the increase of boiler tube use time, the coking of boiler tube inner surface will It can make it that fin role is more and more weaker, its effect for reducing boundary layer can also diminish accordingly.（2）In the inner surface of boiler tube On multiple fins are discretely set, these fins can also reduce the thickness in boundary layer, but likewise as boiler tube inner surface Coking amount increases, and the role of these fins are also less and less.
Therefore, the heat-transfer effect for how further improving boiler tube is the important research direction of enhanced heat transfer component.
The content of the invention
For the above-mentioned technical problem in the presence of prior art, the present invention proposes a kind of heat-transfer pipe.This heat-transfer pipe With good heat-transfer effect.The invention further relates to the pyrolysis furnace using this heat-transfer pipe.
According to the first aspect of the invention, it is proposed that a kind of heat-transfer pipe, including the twisted sheet being arranged on inside pipe wall, distortion Piece twist extends along the axial direction of heat-transfer pipe, and the end from twisted sheet along heat-transfer pipe axial direction is provided with twisted sheet The nonpenerative breach extended towards the other end.
In the heat-transfer pipe of the present invention, in the presence of twisted sheet, rotating flow is become along the fluid of twisted sheet, fluid by In boundary layer can be destroyed with tangential velocity, the purpose of augmentation of heat transfer is reached.In addition, by setting breach, reducing biography The resistance of flow of fluid in heat pipe, so that the droop loss that fluid will be reduced.In addition, breach be not through, i.e. twisted sheet Actually or an entirety, two sides of twisted sheet are connected with heat exchanger tube, add twisted sheet in the tube fluid that exchanges heat Stability under impact.
In one embodiment, the distortion angle of twisted sheet is between 90-1080 °.When distortion angle is smaller, fluid Pressure drop is small, and the tangential velocity of the fluid of rotational flow is also smaller, therefore the heat-transfer effect of heat-transfer pipe is poor.With distortion Angle becomes larger, and the tangential velocity of the fluid of rotational flow can become big, and the heat-transfer capability of heat-transfer pipe can be improved, but fluid Pressure drop can increase.When distortion angle is when between 120-360 °, the heat-transfer capability of heat-transfer pipe and the pressure drop of fluid reach Appropriate scope.The ratio of the internal diameter of twisted sheet axial length and heat-transfer pipe is between 1-10.When the ratio is smaller, and revolve The tangential velocity of the dynamic fluid of turn of tidal stream is also larger, therefore the heat-transfer effect of heat-transfer pipe is preferable, but the pressure drop of fluid is larger.With The ratio gradually to increase, the tangential velocity of the fluid of rotational flow can diminish, the heat-transfer capability of heat-transfer pipe can decrease, but It is that the pressure drop of fluid can reduce.When the ratio is between 2-4, the heat-transfer capability of heat-transfer pipe and the pressure drop of fluid reach Appropriate scope.Cause the fluid in heat exchanger tube that there is enough tangential flow velocitys to destroy boundary layer in this dimensional distortion piece, So as to just there is preferable heat-transfer effect, and reduce the speed of heat exchange tube wall coking.
In one embodiment, the ratio of the area of the area of breach and twisted sheet is between 0.05-0.95.When the ratio When smaller, twisted sheet is larger to the guide functions of fluid, thus heat-transfer pipe heat-transfer effect preferably, but the pressure drop of fluid compared with Greatly.As the ratio gradually increases, twisted sheet can diminish to the guide functions of fluid, and the pressure drop of fluid can diminish, but pass Thermal effect can also be decreased.When the ratio is between 0.6-0.8, the heat-transfer capability of heat-transfer pipe and the pressure drop of fluid reach To appropriate scope.In addition, this area than scope in, the pressure drop of fluid is smaller, and twisted sheet impact resistance compared with It is high.In one embodiment, the contour line of breach is smooth curve.The favourable flow of fluid of smooth curve, reduction flowing resistance Power, and then reduce the droop loss of fluid.In a specific embodiment, curve includes two identical curved sections, two Center line Central Symmetry of the bar curved section on heat-transfer pipe.In one embodiment, the width and heat-transfer pipe of the initiating terminal of breach The ratio of internal diameter is between 0.05-0.95, preferably 0.6-0.8.And any one curved section lacks from the initiating terminal direction of breach Mouthful terminal extension, the ratio of the component of the rate of change of the radius of curvature of curved section in x-axis and heat transfer bore is in 0.05- Between 0.95；Component and the ratio for the bore that conducts heat on the y axis is between 0.05-0.95；Component and heat-transfer pipe in z-axis The ratio of internal diameter is between 1-10.When the ratio of component of the rate of change in z-axis and heat transfer bore of the radius of curvature of curved section When value is smaller, the tangential velocity of rotating fluid is larger, and the heat-transfer effect of heat-transfer pipe is good, but the pressure drop of fluid is larger.When this When ratio becomes larger, tangential velocity can diminish, and the pressure drop of fluid can also diminish, but the heat transfer of heat-transfer pipe effect also can be It is deteriorated.When the ratio is 2-4, the heat-transfer capability of heat-transfer pipe and the pressure drop of fluid reach appropriate scope.By this The notch profile that mode is realized also has optimal fluid-mechanical effect, i.e., its fluid-pressure drop produced is minimum, and twisted sheet Impact resistance highest.
In one embodiment, the quantity of breach is two, and it is axial from the different ends of twisted sheet along heat-transfer pipe Extend towards one another and not through.The ratio of the area of breach of the area of breach in upstream with being in downstream is in 20- Between 0.05.When ratio is larger, the pressure drop of fluid is small, and the tangential velocity of the fluid of rotational flow is also smaller, therefore The heat-transfer effect of heat-transfer pipe is poor.As upstream and downstream area ratio is tapered into, the tangential velocity of the fluid of rotational flow can become Greatly, the heat-transfer capability of heat-transfer pipe can be improved, but the pressure drop of fluid can increase.When the ratio is between 2-0.5, heat-transfer pipe The pressure drop of heat-transfer capability and fluid reach appropriate scope.In addition, the breach in downstream contributes to further reduction The flow resistance of fluid, so as to reduce pressure drop.The weight that breach additionally aids reduction twisted sheet is respectively provided with upstream and downstream, side Just install and use.
In one embodiment, multiple holes are additionally provided with twisted sheet.The fluid and the stream of Radial Flow axially flowed Body can flow through the hole, that is to say, that this some holes can change the flow direction of fluid, so as to strengthen the flow-disturbing in heat-transfer pipe, destroy Boundary layer, reaches the purpose of augmentation of heat transfer.In addition, the fluid of different directions can flow conveniently by this some holes towards downstream It is dynamic, so as to reduce further fluid flow resistance, it reduce further droop loss.Mixed coking lamellar body in a fluid also can Enough through this some holes towards downstream movement, be conducive to the discharge of coking lamellar body.In a preferred embodiment, in adjacent holes The ratio of axial distance and twisted sheet axial length between heart line is between 0.2-0.8.
According to the second aspect of the invention, it is proposed that a kind of pyrolysis furnace, the radiating furnace tube of the pyrolysis furnace includes at least one According to heat-transfer pipe described above, preferably 2-10.
In one embodiment, multiple heat-transfer pipes are axially arranged in radiating furnace tube with interval mode, spacing distance with The ratio of the diameter of heat-transfer pipe is 15-75, preferably 25-50.Spaced multiple heat-transfer pipes are constantly by radiating furnace tube Fluid is changed into rotating flow from piston flow, improves heat transfer efficiency.
In this application, term " piston flow " ideally refers to that fluid is thoroughly mixed in axial flow direction, and in footpath To not mixing completely, complete piston flow is not reached in practice, it is piston flow that can only be approximately considered.
Compared with prior art, the advantage of the invention is that：Twisted sheet is set in heat-transfer pipe, and fluid is along twisted sheet Fluid becomes rotating flow, improves the tangential velocity of flowing, destroys boundary layer, reaches the purpose of augmentation of heat transfer.In twisted sheet On be provided with along heat-transfer pipe axial direction the nonpenerative breach extended from an end of twisted sheet towards the other end.The breach The resistance of flow of fluid in heat-transfer pipe is reduced, so that the droop loss that fluid will be reduced.And breach be not through, i.e., Actually or an entirety, two sides of twisted sheet are connected twisted sheet with heat exchanger tube, add twisted sheet in heat exchanger tube Stability under interior fluid impact.The multiple holes being arranged on twisted sheet can change the flow direction of fluid, so as to strengthen heat-transfer pipe Interior flow-disturbing, reaches the purpose of augmentation of heat transfer.This some holes further reduces fluid flow resistance, reduce further pressure drop Loss.Mixed coking lamellar body in a fluid also can be conducive to the discharge of coking lamellar body through this some holes towards downstream movement.
Brief description of the drawings
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein：
Fig. 1 is the side view of the heat-transfer pipe with twisted sheet according to the present invention；
Fig. 2 and 3 schematically shows the stereogram of the first embodiment of the twisted sheet according to the present invention；
Fig. 4-6 schematically shows A-A, B-B, C-C sectional view of the heat-transfer pipe of Fig. 1 twisted sheet for having used Fig. 2；
Fig. 7 and 8 schematically shows the stereogram of the second embodiment of the twisted sheet according to the present invention；
Fig. 9 schematically shows the stereogram of the 3rd embodiment of the twisted sheet according to the present invention；
Figure 10 schematically shows the stereogram of the twisted sheet according to prior art；
Figure 11 schematically shows the radiating furnace tube of the pyrolysis furnace using the heat-transfer pipe according to invention.
In the accompanying drawings, identical part uses identical reference.Accompanying drawing is not drawn according to actual ratio.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
Fig. 1 schematically shows the side view of the heat-transfer pipe 10 according to the present invention, and guiding is provided with heat-transfer pipe 10 Fluid makees the twisted sheet 11 of rotating flow.Twisted sheet 11 twist extends along the axial direction of heat-transfer pipe 10, in Fig. 2,3,7,8 and 9 The concrete structure of twisted sheet 11 is schematically showed, will hereinafter be illustrated.
Fig. 2 and 3 schematically shows the first embodiment of twisted sheet 11.The distortion angle of twisted sheet 11 is at 90-1080 ° Between.The ratio of the internal diameter of the axial length of twisted sheet 11 and heat-transfer pipe is between 1-10.Jagged 12 are set on twisted sheet 11, Breach 12 axially extends and not through whole distortion along heat-transfer pipe 10 from the upstream end thereof of twisted sheet 11 towards downstream end Piece 11, generally can be interpreted as alphabetical " u "-shaped by breach 12.In this case, the face of the area of breach 12 and twisted sheet 11 Long-pending ratio is between 0.05-0.95.
The axial length of twisted sheet 11 can be referred to as " pitch ", and " pitch " and the ratio of the internal diameter of heat-transfer pipe are referred to as For " distortion ratio ".Distortion angle and distortion can have an impact than all to the fluid rotary degree in heat-transfer pipe 10, in identical distortion ratio On the premise of, the anglec of rotation is bigger, and the tangential velocity of fluid is bigger, but fluid-pressure drop can also be accordingly increased.Twisted sheet 11 selections distortion as described herein with distortion angle than causing the fluid in heat exchanger tube 10 that there is enough tangential flow velocitys to break Bad selvedge interlayer, so as to just there is preferable heat-transfer effect, and reduces the tendency of heat exchange tube wall coking, and the pressure drop of fluid also exists In receptible scope.By setting breach 12 on twisted sheet 11, the contact area of fluid and twisted sheet 11 is greatly reduced, because This reduces the resistance of flow of fluid in heat-transfer pipe 10, so that the pressure drop that will reduce fluid.In addition, breach 12 be not through , i.e., actually or an entirety, two sides of twisted sheet 11 are connected twisted sheet 11 with heat exchanger tube 10, add twisted sheet 11 stability in heat exchanger tube 10.
The contour line of the breach 12 of twisted sheet 11 shown in Fig. 2 and 3 is smooth curve.Smooth curve contributes to reduction The flow resistance of fluid, so as to reduce fluid-pressure drop.The contour curve can be regarded as including two identical curved sections 13,13 ', And center line Central Symmetry of two curved sections 13,13 ' on heat-transfer pipe 10.According to this understanding mode, breach 12 have with Lower technical characteristic, the width of the initiating terminal of breach 12 and the ratio of the internal diameter of heat-transfer pipe 10 are between 0.05-0.95, and curved section 13（Here only it is described by taking curved section 13 as an example）Extend from the terminal 15 of initiating terminal 14 towards the breach 12 of breach 12, curve The ratio of component and conduct heat bore of the rate of change of the radius of curvature of section 13 in x-axis is between 0.05-0.95, on the y axis Component and the bore that conducts heat ratio between 0.05-0.95, the ratio of component in z-axis and heat transfer bore is in 1-10 Between, in this application, " x-axis " refers to the diametric(al) of heat-transfer pipe 10, and " y-axis " refers to perpendicular to the direction of paper, and " z-axis " is Refer to the axial direction of heat-transfer pipe 10.The breach 12 of this form has optimal fluid-mechanical effect, i.e. its fluid pressure produced Drop is minimum, and the impact resistance highest of twisted sheet 11.
In fact, the twisted sheet 11 shown in Fig. 2 and 3 can be regarded as being formed by following mode：One of heat-transfer pipe 10 is straight Footpath rotates around its own midpoint, while the track curved surface of process also along translating axially upwards or downwards for heat-transfer pipe 10, Then using spheroid or the like and track surface intersection and clip the part intersected and formed.So, twisted sheet 11 includes The upper side edge and lower side being parallel to each other, a pair of distortions while and inwall all the time with heat-transfer pipe 10 is contacted during two distortions, with And notch profile curve.Fig. 4-6 schematically shows the cross-sectional view at the diverse location of heat-transfer pipe 10, it may be seen that turning round The torsion form of knee-piece 11.The cross-section parts of breach 12 shown in Fig. 4 are more than the cross-section parts of breach 12 shown in Fig. 5, and this is Because A-A cross sections are closer to the short axle for the ellipsoid for forming breach 12, the twisted sheet 11 that Fig. 6 is shown is without breach, and this is due to In C-C cross-sections in the part do not run through by breach 12 of twisted sheet 11.
Although showing that the breach 12 of twisted sheet 11 is set to its opening towards upstream in fig. 2, top is real towards downstream Breach 12 may be arranged as its top and is open towards upstream towards downstream on border.In this case, fluid is to twisted sheet 11 impulsive force can be substantially reduced, so that the impact resistance of twisted sheet 11 can be higher.
Fig. 7 and 8 schematically shows the second embodiment of twisted sheet 11.The embodiment and twisted sheet 11 shown in Fig. 2 and 3 It is similar, it the difference is that only, two breach 12 and 12 ' are provided with twisted sheet 11, and breach 12 and 12 ' is each since torsion The upstream end thereof and downstream end of knee-piece 11 extend towards one another and not through.Breach 12 ' in downstream contributes into one The flow resistance of step reduction fluid, so as to reduce pressure drop.In addition, being respectively provided with breach in upstream and downstream helps to reduce twisted sheet 11 weight, facilitates the installation of heat-transfer pipe 10 and uses.Preferably, the area of the breach 12 in upstream is with being in downstream The ratio of the area of breach 12 ' is between 2-0.5.In this case, the area sum of breach 12 and 12 ' and twisted sheet 11 The ratio of area is between 0.05-0.95.
Fig. 9 schematically shows the 3rd embodiment of twisted sheet 11.In this embodiment, it is provided with twisted sheet 11 Hole 41.So, fluid can flow through hole 41 and swimmingly towards downstream flow, further reduce the droop loss of fluid.One In individual specific embodiment, the ratio of axial distance and the axial length of twisted sheet 11 between the center line of adjacent holes is in 0.2- Between 0.8.
The invention further relates to the pyrolysis furnace using heat-transfer pipe 10 described above（It is not shown）.Pyrolysis furnace is the technology of this area Described in personnel, repeat no more here.At least one biography described above is provided with the radiating furnace tube 50 of this pyrolysis furnace 3 are schematically showed in heat pipe 10, such as Figure 11.Preferably, these heat-transfer pipes 10 are axially arranged on spoke with interval mode Penetrate in boiler tube 50.For example, the ratio of the axial distance and the internal diameter of heat-transfer pipe 10 between adjacent heat-transfer pipe 10 is 15-75, enter one Step is preferably that the fluid in 25-50, such radiating furnace tube constantly can be changed into rotating flow from piston flow, improves heat transfer effect Rate.It should be noted that, when the quantity of heat-transfer pipe is multiple, the twisted sheet in these heat-transfer pipes 10 can be in Fig. 2,7,9 Form shown in one.
Illustrated below with specific embodiment using the present invention heat-transfer pipe 10 after, the radiating furnace tube 50 of pyrolysis furnace Heat transfer efficiency and pressure drop.
Embodiment 1：
The heat-transfer pipe 10 of twisted sheet shown in 6 Fig. 2 is installed on a radiating furnace tube of pyrolysis furnace.Heat-transfer pipe 10 it is interior Footpath is 51mm, and the ratio of the component and heat transfer bore of the rate of change of the radius of curvature of curved section in x-axis is 0.6；On the y axis Component with heat transfer bore ratio be 0.6；The ratio of component and heat transfer bore in z-axis is 2, the He of twisted sheet 11 11 ' distortion angle is 180 °, and distortion ratio is 2.5, and the distance between adjacent heat-transfer pipe 10 is the 50 of heat transfer pipe diameter 10 Times.Experiment finds that the heat transfer load of the radiating furnace tube is 1278.75KW, and pressure drop is 70916.4Pa.
Comparative example 1：
6 heat-transfer pipes 50 ' of the prior art are mounted with the radiating furnace tube of pyrolysis furnace.The structure of the heat-transfer pipe 50 ' To be provided with twisted sheet 51 ' in the housing of heat-transfer pipe 50 ', and heat-transfer pipe 50 ' is divided into two and not connected by the twisted sheet 51 ' Material channel, as shown in Figure 10.The internal diameter of heat-transfer pipe 50 ' is 51mm, and the distortion angle of twisted sheet 51 ' is 180 °, distortion ratio Example is 2.5, and the distance between adjacent heat-transfer pipe 50 ' is 50 times of heat transfer pipe diameter 50 '.Experiment finds that the radiating furnace tube is passed Thermic load heat transfer load 1264.08KW, pressure drop is 71140Pa.
Pass through above example and comparative example, it is possible to find used the all-radiant furnace of the pyrolysis furnace according to heat-transfer pipe of the invention The heat transfer efficiency of pipe is greatly improved than the heat transfer efficiency of the radiating furnace tube of the pyrolysis furnace of the heat-transfer pipe using prior art, And pressure drop is also reduced.These features are very favorable for hydrocarbon cracking reaction.
Although by reference to preferred embodiment, invention has been described, is not departing from the situation of the scope of the present invention Under, various improvement can be carried out to it and part therein can be replaced with equivalent.Especially, as long as in the absence of structure punching Prominent, the every technical characteristic being previously mentioned in each embodiment can combine in any way.The invention is not limited in text Disclosed in specific embodiment, but all technical schemes including falling within the scope of the appended claims.

Claims (21)

1. a kind of heat-transfer pipe, including the twisted sheet being arranged on inside pipe wall, axial direction of the twisted sheet along the heat-transfer pipe are in spiral shell Shape extension is revolved, is provided with the twisted sheet along an end from the twisted sheet for heat-transfer pipe axial direction and originates extension And towards the nonpenerative breach of the other end extension, the breach takes the shape of the letter U.
2. heat-transfer pipe according to claim 1, it is characterised in that the area of the breach and the area of the twisted sheet Ratio is between 0.05-0.95.
3. heat-transfer pipe according to claim 1 or 2, it is characterised in that the contour line of the breach is smooth curve.
4. heat-transfer pipe according to claim 3, it is characterised in that the curve includes two identical curved sections, described Center line Central Symmetry of two curved sections on the heat-transfer pipe.
5. heat-transfer pipe according to claim 4, it is characterised in that the width of the initiating terminal of the breach and the heat-transfer pipe The ratio of internal diameter is between 0.05-0.95, and end of any one curved section from the initiating terminal of the breach towards the breach End extension, the ratio of the component of the rate of change of the radius of curvature of the curved section in x-axis and heat transfer bore is in 0.05-0.95 Between；Component and the ratio for the bore that conducts heat on the y axis is between 0.05-0.95；Component and heat transfer bore in z-axis Ratio between 1-10.
6. heat-transfer pipe according to claim 5, it is characterised in that the quantity of the breach is two, and it is from described The different ends of twisted sheet along the heat-transfer pipe be axially facing each other extension and not through.
7. heat-transfer pipe according to claim 6, it is characterised in that the area of the breach in upstream and lacking in downstream The ratio of the area of mouth is between 20-0.05.
8. heat-transfer pipe according to claim 2, it is characterised in that multiple holes are additionally provided with the twisted sheet.
9. heat-transfer pipe according to claim 8, it is characterised in that axial distance between the center line of adjacent holes with it is described The ratio of twisted sheet axial length is between 0.2-0.8.
10. heat-transfer pipe according to claim 1, it is characterised in that the distortion angle of the twisted sheet 90-1080 ° it Between.
11. heat-transfer pipe according to claim 1, it is characterised in that the twisted sheet axial length and the heat-transfer pipe The ratio of internal diameter is between 1-10.
12. heat-transfer pipe according to claim 2, it is characterised in that the area of the area of the breach and the twisted sheet Ratio between 0.6-0.8.
13. heat-transfer pipe according to claim 5, it is characterised in that the width of the initiating terminal of the breach and the heat transfer The ratio of bore is between 0.6-0.8.
14. heat-transfer pipe according to claim 5, it is characterised in that the rate of change of the radius of curvature of the curved section is in z-axis On component and conduct heat bore ratio between 2-4.
15. heat-transfer pipe according to claim 7, it is characterised in that the area of the breach in upstream is with being in downstream The ratio of the area of breach is between 2-0.5.
16. heat-transfer pipe according to claim 10, it is characterised in that the distortion angle of the twisted sheet 120-360 ° it Between.
17. heat-transfer pipe according to claim 11, it is characterised in that the twisted sheet axial length and the heat-transfer pipe The ratio of internal diameter is between 2-4.
18. a kind of pyrolysis furnace, it is characterised in that the radiating furnace tube of the pyrolysis furnace is arrived including at least one according to claim 1 Heat-transfer pipe any one of 17.
19. pyrolysis furnace according to claim 18, it is characterised in that the quantity of the heat-transfer pipe is 2-10.
20. pyrolysis furnace according to claim 19, it is characterised in that the heat-transfer pipe is axially arranged on interval mode In the radiating furnace tube, the ratio of the diameter of spacing distance and heat-transfer pipe is 15-75.
21. pyrolysis furnace according to claim 20, it is characterised in that the ratio of the diameter of the spacing distance and heat-transfer pipe For 25-50.
CN201310512687.2A 2012-10-31 2013-10-25 Heat-transfer pipe and use its pyrolysis furnace Active CN104560111B (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
CN201310512687.2A CN104560111B (en) 2013-10-25 2013-10-25 Heat-transfer pipe and use its pyrolysis furnace
GB1319082.2A GB2519606B (en) 2013-10-25 2013-10-29 Heat transfer tube with a twisted baffle and cracking furnace using the heat transfer tube
CA2832083A CA2832083C (en) 2013-10-25 2013-10-29 Heat transfer tube and cracking furnace using the same
SG2013080742A SG2013080742A (en) 2013-10-25 2013-10-30 Heat transfer tube and cracking furnace using the same
BE2013/0737A BE1022059B1 (en) 2013-10-25 2013-10-30 HEAT TRANSFER TUBE AND CRACK CRUISER USING THEM
RU2013148375A RU2640876C2 (en) 2013-10-25 2013-10-30 Heat-transfer tube and cracking furnace with usage of heat-transfer tube
BR102013027956-0A BR102013027956B1 (en) 2012-10-31 2013-10-30 CRACKING OVEN HAVING A RADIANT COIL
NL2011705A NL2011705B1 (en) 2013-10-25 2013-10-30 Heat transfer tube and cracking furnace using the same.
FR1360637A FR3012591B1 (en) 2013-10-25 2013-10-30 HEAT TRANSFER TUBE AND CRACKING OVEN USING THE SAME
JP2013226900A JP6437719B2 (en) 2013-10-25 2013-10-31 Heat transfer tubes and cracking furnaces using heat transfer tubes
DE201310222185 DE102013222185A1 (en) 2013-10-25 2013-10-31 Heat transfer tube and cracking furnace using the heat transfer tube
KR1020130131030A KR102143481B1 (en) 2013-10-25 2013-10-31 Heat transfer tube and cracking furnace using the same
US14/068,543 US10209011B2 (en) 2013-10-25 2013-10-31 Heat transfer tube and cracking furnace using the same
US16/232,759 US11215404B2 (en) 2013-10-25 2018-12-26 Heat transfer tube and cracking furnace using the same

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CN201310512687.2A CN104560111B (en) 2013-10-25 2013-10-25 Heat-transfer pipe and use its pyrolysis furnace

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CN104560111B true CN104560111B (en) 2017-08-25

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GB2519606B (en) 2020-02-12
BR102013027956B1 (en) 2019-10-08
BE1022059B1 (en) 2016-02-11
US11215404B2 (en) 2022-01-04
RU2640876C2 (en) 2018-01-12
US10209011B2 (en) 2019-02-19
FR3012591A1 (en) 2015-05-01
GB2519606A (en) 2015-04-29
JP6437719B2 (en) 2018-12-12
BR102013027956A2 (en) 2015-07-21
GB201319082D0 (en) 2013-12-11
KR20150048000A (en) 2015-05-06
JP2015083910A (en) 2015-04-30
CA2832083C (en) 2020-05-19
FR3012591B1 (en) 2017-09-01
NL2011705B1 (en) 2016-07-15
NL2011705A (en) 2015-04-29
DE102013222185A1 (en) 2015-04-30
CN104560111A (en) 2015-04-29
CA2832083A1 (en) 2015-04-25
SG2013080742A (en) 2015-05-28
US20150114609A1 (en) 2015-04-30
KR102143481B1 (en) 2020-08-11
US20190128622A1 (en) 2019-05-02
RU2013148375A (en) 2015-05-10

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Application publication date: 20150429

Assignee: YANTAI MANOIR HEAT RESISTANT ALLOYS Co.,Ltd.

Assignor: BEIJING RESEARCH INSTITUTE OF CHEMICAL INDUSTRY, CHINA PETROLEUM & CHEMICAL Corp.

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Denomination of invention: Heat transfer tube and cracking furnace using it

Granted publication date: 20170825

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Record date: 20221009